Pole Mount Fans attach to 4, 6 or 8 poles with U-bolts (not included). These quality fans include an enclosed permanently lubricated, PSC-type ball bearing single-phase motor for long life and optimum performance. 3 quiet aluminum blades are enclosed in double locking chrome plated steel wire guards for safety. Pivot-action fan head allows vertical tilt angle adjustments. Easy assembly with pre-assembled fan heads and mounts. Meets OSHA standards, UL listed. Explosion Proof Models feature Class I and II protection for flammable and carbon dust environment protection. Available in 120V/240V with single-phase motor or 240V/480V, 3-phase motor. 1 Year Limited Warranty.